Swivel chair



FIG. 1 is a front view of a swivel chair showing my new design;

FIG. 2 is a back view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is an upward view thereof;

FIG. 7 is a perspective view thereof; and,

FIG. 8 is a partial enlarged view of the indicated area “8” in FIG. 6.

The broken lines depicting portions of the swivel chair form no part of the claimed design. 

CLAIM The ornamental design for swivel chair, as shown and described. 